An XRD study of the effect of the SiO2/Na2O ratio on the alkali activation of fly ash

被引：469

作者：

Criado, M.

Fernandez-Jimenez, A.

de la Torre, A. G.

Aranda, M. A. G.

Palomo, A.

机构：

[1] CSIC, Eduardo Torroja Inst, Madrid, Spain

[2] Univ Malaga, Dept Inorgan Chem, E-29071 Malaga, Spain

来源：

CEMENT AND CONCRETE RESEARCH | 2007年 / 37卷 / 05期

关键词：

fly ash; Rietveld method; silicate-sodium oxide ratio;

D O I：

10.1016/j.cemconres.2007.01.013

中图分类号：

TU [建筑科学];

学科分类号：

0813 [建筑学];

摘要：

Soluble silica has a very significant effect on the microstructural and mechanical development of the cementitious materials produced as a result of the alkali activation of fly ash. In this study, four different alkaline solutions with different soluble silica contents were used to activate fly ash. The primary reaction product was a sodium alummosilicate gel, while different types of zeolites appeared as minority phases. The percentage and composition of these reaction products were found to depend on both the soluble silica content present in the activating solutions and the thermal curing time. In addition, the amount of gel was observed to have a decisive effect on the mechanical strength developing in the material. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：671 / 679

页数：9

共 32 条

[1]

[Anonymous], STUDIES SURFACE SCI

[2]

[Anonymous], SOIL SILICATES

[3]

Identification and characterisation of thaumasite by XRPD techniques [J].